1297437 - [e10s][a11y] page load is extremely slow and gets unresponsive since 22-Aug-2016 Nightly51.0a1

Status: RESOLVED WORKSFORME

(Core :: Disability Access APIs, defect)

Description

[Alice0775 White]

[Tracking Requested - why for this release]: Performance regression on Youtube(at least)

Build Identifier:
https://hg.mozilla.org/mozilla-central/rev/24763f58772d45279a935790f732d80851924b46
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0 ID:20160823030224

Reproducible: always

Steps To Reproduce:
1. Open https://www.youtube.com/channel/UCxVlUVEiwY43qLhCB7kMBIw
2. Try to scroll to bottom with mouse wheel while page is loading
   ---- Observe: Slow, Laggy and sometimes unresponsive
3. Mouse hover "Popular Upload" and Click [Play All]
4-A-1. Switch to the other applications, so that Nightly is inactive
   ---- Observe: sound distortion
4-A-2. Click The Nightly taskbar button or right click the button
   ---- Observe: unresponsive for a while
4-B. Try to scroll with mouse wheel while page is loading
   ---- Observe: Slow, Laggy and sometimes unresponsive

Comment 1

[Alice0775 White]

Regression window:
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=b6cf6d7a95f993f1b3f656ccaad5445368c85cb2&tochange=183c29790c23279326021e0f6ea6e2c72fb47fc9

Suspect: Bug 1268544

Comment 2

[Alice0775 White]

Setting the following preferences seems to fix the problem.

user_pref("accessibility.force_disabled", 1);

Comment 3

[(No longer employed by Mozilla) Aaron Klotz]

Are you force-enabling e10s?
Are you running with a touch screen?

Comment 4

[Alice0775 White]

(In reply to Aaron Klotz [:aklotz] from comment #3)
> Are you force-enabling e10s?

YES

> Are you running with a touch screen?

NO


Windows10RS1 Home x64 seems to disable e10s by some reason.

Comment 5

[Marcia Knous [:marcia]]

Tracking 51+ since this is reproducible and a top site.

Comment 6

[(No longer employed by Mozilla) Aaron Klotz]

I have not been able to reproduce this on my Surface Book. Jim, have you noticed anything when a11y+e10s is force enabled?

Comment 7

[Alice0775 White]

The problem(page load is slowu / nresponsive) is not only on youtube but also wikipedia....

https://en.wikipedia.org/wiki/Firefox page load is slow, and become unresponsive while scroll up and down.

So, not Audio/Video specific.

Comment 8

[(No longer employed by Mozilla) Aaron Klotz]

Alice0775 White, do you use an IME? I wonder if that needs to be factored into this somehow...

Comment 9

[Alice0775 White]

(In reply to Aaron Klotz [:aklotz] from comment #8)
> Alice0775 White, do you use an IME? I wonder if that needs to be factored
> into this somehow...

Yes, I use Japanese IME
* Microsoft IME
* ATOK2016  <---- default


And also I changed Windows10 text size from Contorol panel.
1. Open Control Panel > Appearance and Personalisation > Display
   (or Start > Settings > System > Display > Advances display settings > Advanced sizing of text and other items)
2. "Change the text size only"
    "Title Bar", "Menu", "Message boxes" etc.  and select all "11"

Comment 10

[Jim Mathies [:jimm]]

Alice, any chance this was bug 1295214?

Comment 11

[Alice0775 White]

(In reply to Jim Mathies [:jimm] from comment #10)
> Alice, any chance this was bug 1295214?

I can still reproduce the problem on the latest Nightly51.0a1.

https://hg.mozilla.org/mozilla-central/rev/1a5b53a831e5a6c20de1b081c774feb3ff76756c
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0 ID:20160829030202

Comment 12

[Gerry Chang [:gchang]]

Hi :jimm,
The issue still can be seen in nightly, can you help shed some light here?

Comment 13

[Jim Mathies [:jimm]]

We'll look at this via our a11y+e10s work.

Comment 14

[(No longer employed by Mozilla) Aaron Klotz]

Alice, ATOK2016 is a third-party IME, correct? Do you know if there is a trial version or something that I would be able to run to attempt to reproduce your problem?

Comment 15

[Alice0775 White]

Attachment: Screenshot : Procedure to download Atok2016Tryal_30Days

There seems no English page. Sorry

Download ATOK2016Trial 30days:
0. http://www.atok.com/try/?w=dl_t
1. After open the page, Please follow attached screenshot

Comment 16

[(No longer employed by Mozilla) Aaron Klotz]

Thanks, I am now downloading it :-)

Comment 17

[Jim Mathies [:jimm]]

Hey Alice, are you able to reproduce this on current aurora (51) with e10s on?

Comment 18

[Alice0775 White]

Yes, I can still reproduce.
On new profile, e10s is disabled(Disabled by accessibility tools) for some reason. Of course, the page load is normal.

However, 
A. When forced to enable e10s, the page load is extremely slow and browser becomes unresponsive for a while(10sec+). <--- this bug
B. When forced to enable e10s and disable accessibility, the page load is normal.

Tested with STR comment#7 on Aurora51.0a2[1] and Nightly52.0a1[2].

[1]
https://hg.mozilla.org/releases/mozilla-aurora/rev/af5a59737002cc4e8bb0f69acddb2583a9d952c6
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0 ID:20161005004013

[2]
https://hg.mozilla.org/mozilla-central/rev/ea104eeb14cc54da9a06c3766da63f73117723a0
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0 ID:20161005030211

Comment 19

[Alice0775 White]

[Tracking Requested - why for this release]:

Comment 20

[Alice0775 White]

I can also reproduce the hang on today's Nightly52.0a1[1].
And It is worse than yesterday's build. Taskbar also hang up for a long period.

[1]
https://hg.mozilla.org/mozilla-central/rev/777fb63db8de8d78b64b8141d1a998397275dd03
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0 ID:20161006030208

Comment 21

[Alice0775 White]

[Tracking Requested - why for this release]:

Comment 22

[David Bolter [:davidb] (NeedInfo me for attention)]

We're hoping this will go away with a fix (on another bug) landed in central this morning.

Comment 23

[Alice0775 White]

(In reply to David Bolter [:davidb] from comment #22)
> We're hoping this will go away with a fix (on another bug) landed in central
> this morning.

Yep, Seems fixed on Nightly52.0a1.

Hope uplift the bunch of patch to 51.0a2.

Comment 24

[(No longer employed by Mozilla) Aaron Klotz]

That's great news! I do plan to attempt uplift. It will be up to release management to approve that, of course...